Roulette is one of the most recognisable casino games in the world and one of the most consistently popular formats on online platforms. Its appeal comes from a combination of simplicity and variety. The base mechanic is straightforward — a ball spins around a wheel and lands on a numbered pocket — but the range of available bets, the different odds attached to each, and the distinction between game variants create enough depth to reward players who take the time to understand what they are playing. Roulette is a pure game of chance with no decisions that influence the outcome of the spin, but understanding the probability and payout structure behind each bet type makes a direct difference to how you approach the game and what you can reasonably expect from a session. This guide is part of Casino Games Explained and covers the full rules of roulette, every major bet type and its associated odds, the key differences between European and American roulette, and what players should understand about the house edge before playing on SkyExchange. Players who enjoy roulette’s combination of simple mechanics and varied betting options will find the Sic Bo guide an interesting companion, as both games offer a wide range of bet types across a single outcome determined by chance.
The Objective of Roulette
The objective of roulette is to predict where the ball will land after the wheel completes its spin. The roulette wheel contains numbered pockets ranging from zero to thirty-six, with European roulette featuring a single zero and American roulette featuring both a single zero and a double zero. Players place their bets on the roulette table layout before the spin begins, and winning bets are determined by the number the ball lands on at the end of the spin.
Roulette offers more variety in its betting options than almost any other casino game of comparable simplicity. A player can bet on a single number for the highest possible payout, or spread their wager across large sections of the wheel for a lower payout with a higher probability of winning. Understanding the full range of available bets and what each one pays is the foundation of playing roulette with accurate expectations.
Inside Bets
Inside bets are wagers placed on specific numbers or small groups of numbers within the main numbered grid of the roulette table layout. They carry lower probability of winning than outside bets but offer significantly higher payouts when they do win.
A straight bet is a wager on a single number. It pays thirty-five to one, meaning a winning straight bet on a hundred rupee wager returns three thousand five hundred rupees in profit. The probability of winning a straight bet on a single spin in European roulette is one in thirty-seven, reflecting the thirty-six numbered pockets plus the single zero.
A split bet covers two adjacent numbers on the table layout and pays seventeen to one. A street bet covers three numbers in a horizontal row and pays eleven to one. A corner bet, also called a square bet, covers four numbers that form a square on the layout and pays eight to one. A line bet covers six numbers across two adjacent rows and pays five to one.
These inside bet types allow players to target specific sections of the wheel with varying levels of coverage and payout. The higher the number of numbers covered by a single bet, the lower the payout ratio but the higher the probability of that bet winning on any given spin.
Outside Bets
Outside bets are wagers placed on broader categories of outcomes rather than specific numbers. They offer higher probability of winning on any individual spin but pay at lower odds that reflect that higher probability.
Red or black is the simplest outside bet and asks players to predict the colour of the pocket the ball will land in. It pays even money, meaning a winning bet doubles the stake, and covers eighteen of the thirty-seven pockets in European roulette excluding the zero. Odd or even follows the same structure, paying even money on a prediction of whether the winning number will be odd or even. High or low bets cover either the numbers one through eighteen or nineteen through thirty-six and also pay even money.
Dozen bets divide the numbered grid into three groups of twelve consecutive numbers and pay two to one on a correct prediction. Column bets cover one of the three vertical columns of twelve numbers on the table layout and also pay two to one. These bet types offer a middle ground between the high risk of inside bets and the near even-money odds of colour and odd-even wagers.
The Zero and the House Edge
The zero pocket is the source of the house edge in roulette. Outside bets that cover red or black, odd or even, and high or low do not include the zero in their coverage, which means the ball landing on zero results in a loss for all of these bets despite them covering nearly half the wheel. This single omission is what gives the casino its mathematical advantage over players in the long run.
In European roulette with a single zero, the house edge is approximately two point seven percent across all standard bets. This means that for every hundred rupees wagered, the game returns approximately ninety-seven point thirty rupees to the player over a statistically significant number of spins. American roulette introduces a second zero pocket, which raises the house edge to approximately five point four percent and makes it a significantly less favourable game for players. Choosing European roulette over American roulette wherever both options are available is one of the most straightforward decisions a roulette player can make to reduce the house edge they are playing against.
Some European roulette variants apply a rule called La Partage, which returns half of all even-money outside bets to players when the ball lands on zero rather than treating the zero as a complete loss for those bets. Where this rule is in effect it reduces the house edge on even-money bets to approximately one point three five percent, making it the most player-friendly version of roulette available.
European vs American Roulette
The difference between European and American roulette comes down entirely to the presence of the double zero in the American version. The double zero adds one additional pocket to the wheel without changing any of the payouts, which means every bet covers a slightly smaller proportion of the total pockets than it does in the European version. The result is a house edge that is approximately double that of European roulette across all bet types.
There is no compensating advantage to the American version from a player perspective. The payouts are identical, the betting options are identical, and the playing experience is substantially similar. The only meaningful difference is the increased house edge created by the double zero. Unless American roulette is the only version available, European roulette is always the preferable choice.
Roulette Betting Systems
Several well-known betting systems are associated with roulette, with the Martingale being the most widely discussed. The Martingale system involves doubling the bet after every loss so that a single win recovers all previous losses and produces a profit equal to the original stake. While this system can produce short-term winning streaks, it requires exponentially increasing bet sizes after consecutive losses, which rapidly reaches either the player’s budget limit or the table’s maximum bet limit. The Martingale does not change the house edge or improve the long-term mathematical outcome of playing roulette.
No betting system applied to roulette can overcome the house edge over a sufficient number of spins, because the edge is built into the structure of the game through the zero pockets. Betting systems affect how wins and losses are distributed across a session but do not change the underlying probability of any individual spin. Understanding this prevents players from placing excessive confidence in systems that appear to work during a short run but cannot sustain that performance indefinitely.
Live Roulette
Live roulette replaces the digital wheel animation of standard online roulette with a real dealer spinning a physical wheel in a studio environment, streamed in real time. The rules, bet types, and payouts are identical to the standard game, but the live format adds visible confirmation of the physical randomness of each spin and the interactive element of a real dealer managing the session.
Live roulette tables typically offer European roulette as the standard format, with some platforms offering premium live tables with additional features such as statistics displays showing recent winning numbers, bet history tracking, and race track betting interfaces that allow players to place sector bets covering specific sections of the wheel more easily than the standard table layout allows. The pace of live roulette is slightly slower than digital roulette because each spin requires the physical process of the dealer setting the wheel in motion and waiting for the ball to settle, which suits players who prefer a more measured playing rhythm and want to observe each spin in full before the next betting window opens.
